Things You Might Not Know About Castle

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9. Whedonverse 

Since Nathan Fillion was the star of the cult classic sci-fi series Firefly, which unfortunately only ran for one season, there have been many connections made between Castle and the iconic Joss Whedon universe of shows and characters. Several actors who appeared on Buffy the Vampire Slayer have been seen on Castle, including Marc Blucas, Ethan Erickson, Leonard Roberts, Bailey Chase and D.B. Woodside. There are also several jokes and references to Firefly itself and in “Vampire Weekend” Fillion begins the episode in his Firefly costume.

Source: YouTube

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8. Star Trek

As well as Firefly and the “Whedonverse,” Castle has had many connections to the major sci-fi series Star Trek. Michael Dorn, known for his role as Worf on Star Trek, appeared as Beckett’s psychiatrist. Tim Russ also appeared as Dr. Malcolm Wickfield and Jonathan Frakes, known as William T. Riker in Star Trek, directed the episodes “Kill the Messenger” and “The Final Frontier,” and there have been several other appearances by well known Star Trek actors.

Source: YouTube

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7. Talented

Actress Stana Katic is a very talented actress, but it turns out she is also multilingual! Katic can speak English, Italian, French and Serbian fluently and can also adopt perfect accents in English, British, South African, Greek and Spanish.

Photo by Broadimage/REX

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6. Real Couple

As it turns out, Juliana Dever, who plays Detective Kevin Ryan’s wife in the series, is actually his wife in real life. Seamus and Juliana Dever were married on May 27, 2006.

Photo by Peter Brooker / Rex Features

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5. Nikki Heat and Derrick Storm Books

Since the premise of the show revolves around author Richard Castle using Detective Kate Beckett as inspiration for his Heat Wave novels, ABC and Hyperion Books released the novels as tie-ins in real life. The novels are written as stand-alone stories and readers do not have to watch the series to understand, but the author is credited as Richard Castle and they do contain some jokes and references that tie-in to the show. There have been seven Nikki Heat novels released, all placing on the New York Times Best Seller List, and there have also been two Derrick Storm novels released.

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4. Book Cameos

Speaking of books, in almost every episode Detective Kevin Ryan played by Seamus Dever is shown carrying a book. Those who pay close attention will notice that the books are always one of Castle’s novels and there is usually a different one for each episode.

Randy Holmes / © ABC / Courtesy: Everett Collection

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3. Always There

Only Nathan Fillion (Richard Castle), Jon Huertas (Javier Esposito) and Seamus Dever (Kevin Ryan) appear in all 173 episodes of the show. Stana Katic (Kate Beckett) has missed two episodes even though she has been credited in them all.

Vivian Zink / © ABC / Courtesy: Everett Collection

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2. Canadians

Both Nathan Fillion and Stana Katic were born in Canada! Fillion is from Edmonton, Alberta, and grew up and attended school there before moving to New York City in 1994. Meanwhile, Katic was born in Hamtilon, Ontario, after her parents came from Croatia. She spent her childhood moving between the U.S. and Canada and studied at the University of Toronto.

Photo by BDG / Rex Features (

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1. Finding Beckett

According to Castle’s creator and writer Andrew W. Marlowe, Nathan Fillion had to read with 125 different actresses in order to find the perfect Kate Beckett for his Richard Castle. In the end, it came down to Stana Katic and one other actress and, after coming out of hair and makeup for her final callback, Katic realized she didn’t like the blouse she was wearing because it was too long. After getting a pair of scissors she saw Nathan Fillion and he asked if she wanted to run lines and she said, “No, but speaking of lines, can you cut a straight line?” He replied, “I can try,” and cut her blouse for her and after the producers watched this entire interaction between the two, Katic got the part!

Adam Taylor / ©ABC / courtesy Everett Collection

Telisa Carter

Telisa enjoys learning and writing about all things entertainment in the world of Hollywood. When she isn't catching up on her favorite TV shows, she likes to read, and obsess over all things football.